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新型螺旋锥体挤土钻头由上下两部分组成,下部分是螺旋锥体结构,在挤土过程中占主要作用。它是由锥体芯管、截面为四边形的螺旋叶片和钻头门组成,在下旋钻进过程中,每个组成部分都在作有效挤土运动。上部分是螺旋柱体结构,它是由柱体芯管、截面为四边形并带有缺口的螺旋叶片和钻头接头组成。在上旋提升过程中,螺旋柱体叶片对已挤扩成型的桩孔进行二次挤压,防止缩径。其目的在于提供一种钻进动力消耗低、钻进效率高、能够穿透各种复杂土层、用于施工螺旋挤土灌注桩的更高效、更实用的钻头。
The new spiral cone squeezed bit consists of two parts up and down, the lower part is a spiral cone structure, in the process of squeezing the main role. It is composed of a conical core tube, a quadrilateral helical blade and a drill door, and each component is effectively squeezed into soil during the submerged drilling. The upper part is a spiral cylinder structure, which is composed of a cylinder core tube, a quadrilateral cross-section and a notch with a spiral blade and a bit joint. In the process of ascension and lifting, the screw cylinder blade has been squeezed into the shape of the pile hole secondary extrusion, to prevent the diameter. The purpose of the utility model is to provide a more efficient and practical drill bit for drilling spiral screw-soil grouting piles with low power consumption, high drilling efficiency, and capable of penetrating various complicated soil layers.